新手请高手解决:Extjs+PHP做的二级联动不显示?

[code="java"]
var TypeStore=new Ext.data.Store({
proxy:new Ext.data.HttpProxy({url:"system/module/type/data/getAllType.php"}),
reader:new Ext.data.JsonReader({root:'root'},[{name:'productstype_id'},{name: 'productstype_name'}])

});
var productsType = new Ext.form.ComboBox({
store:TypeStore,fieldLabel: '所屬種類',name: 'txtProductsType',
emptyText: '請選擇產品種類',mode: 'remote',triggerAction: 'all',
valueField: 'productstype_id',displayField: 'productstype_name',
allowBlank: false,readOnly:true
});

productsType.on('select',function(comboBox){
var TypeID=comboBox.getValue();
ProductStore.load({params:{id:TypeID}}); //加载产品数据源.根据种类ID来返回产品的资料.
});
var ProductStore=new Ext.data.Store({
proxy:new Ext.data.HttpProxy({url:"system/module/products/data/getAllProducts.php"}),
reader:new Ext.data.JsonReader({root: 'products'},
[{name:'productsinfo_id'},{name:'productsinfo_name'}])
});

var productsName = new Ext.form.ComboBox({
store:ProductStore,fieldLabel: '設備名稱',name: 'txtProductsName',

emptyText: '請選擇設備名稱',mode: 'remote',triggerAction: 'all',
valueField: 'productsinfo_id',displayField: 'productsinfo_name',
allowBlank: false,readOnly:true
});
[/code]
这个是我的二级联动的代码?为什么我选择一个种类后,设备是加载进去了...但是当我点击设备下拉框时就什么数据都没有了?

[quote]这个是我的二级联动的代码?为什么我选择一个种类后,设备是加载进去了...但是当我点击设备下拉框时就什么数据都没有了? [/quote]

 从你的描述的内容来看,可以分析得出,你第一次加载的数据确实加载了.但是不符合第二个下拉的格式,所以无法显示出来. 你仔细参考一下第一个下拉的格式和第二个下拉的格式有和区别

[code="js"]

//Format with http://jsbeautifier.org/

var TypeStore = new Ext.data.Store({
proxy: new Ext.data.HttpProxy({
url: "system/module/type/data/getAllType.php"
}),
reader: new Ext.data.JsonReader({
root: 'root'
},
[{
name: 'productstype_id'
},
{
name: 'productstype_name'
}])
});
var productsType = new Ext.form.ComboBox({
store: TypeStore,
fieldLabel: '所屬種類',
name: 'txtProductsType',
emptyText: '請選擇產品種類',
mode: 'remote',
triggerAction: 'all',
valueField: 'productstype_id',
displayField: 'productstype_name',
allowBlank: false,
readOnly: true
});
productsType.on('select', function (comboBox) {
var TypeID = comboBox.getValue();
ProductStore.load({
params: {
id: TypeID
}
}); //加载产品数据源.根据种类ID来返回产品的资料.
});
var ProductStore = new Ext.data.Store({
proxy: new Ext.data.HttpProxy({
url: "system/module/products/data/getAllProducts.php"
}),
reader: new Ext.data.JsonReader({
root: 'products'
},
[{
name: 'productsinfo_id'
},
{
name: 'productsinfo_name'
}])
});
var productsName = new Ext.form.ComboBox({
store: ProductStore,
fieldLabel: '設備名稱',
name: 'txtProductsName',
emptyText: '請選擇設備名稱',
mode: 'remote',
triggerAction: 'all',
valueField: 'productsinfo_id',
displayField: 'productsinfo_name',
allowBlank: false,
readOnly: true
});
[/code]